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Another ABS problem

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Ghiribizzo:
Inside the abs block. As Alexm1 said - have you tried the bleed test on GS911? What did it say?
I'd expect a problem as you normally need to press very hard on the pedal to get the pressure up and hold to see if it maintains it.
But if the 'apparent' fault is over pressure (even if there isn't any in reality...) then the pump wont run and well - i *think* you would not be able to complete the bleed test.
Keep us posted.


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Ghiribizzo:
I also wondered about brake lines. Ive changed plenty originals where they ballooned up - hoses coming apart internally. They can also fail where they wont release built up pressure. But you were able to get fluid through the rear wheel circuit?


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Old goat:
Hello ManxGS
I hate to be the bearer of bad tidings, but your symptoms are exactly the same as I had on my 2005 R1200RT with the same electrically-assisted  iABS-1 system. I could not resolve it by any amount of flushing and clearing fault codes and I learnt that what I had was typical of a failure of the ABS unit, presumably of the rear brake pressure sensor though that was never made perfectly clear. The unit is not serviceable: BMW do not supply parts and there seems to be no one (in the UK at least) able to overhaul them. BMW abandoned this system after 3 years (I think) and so the bikes with it are now old and interest must be waning. Faced with the absurdly high cost of a new unit I had the ABS system removed so that the bike now has conventional non-assisted braking. I much prefer the brakes now. They are just as powerful but without the grabby operation of the assisted operation. It was done by Sherlocks and the result is that everything still works (speedometer, self-cancelling of direction indicators ...) and there are no brake warning messages, but there is course no ABS. You also lose the warning triangle in the instrument panel. The ABS unit (separated from the hydraulic parts) is retained and will reveal fault codes to a GS911, but these no longer matter. The cost on my bike was less than £450 – I think it varies a bit according to model. They did it in the day and lent me a bike while it was in.
The alternative approach is second hand unit, but it will be expensive and there will always be the fear of another failure.
Good luck

ManxGS:

--- Quote from: Ghiribizzo on January 30, 2017, 12:35:34 PM ---Inside the abs block. As Alexm1 said - have you tried the bleed test on GS911? What did it say?
I'd expect a problem as you normally need to press very hard on the pedal to get the pressure up and hold to see if it maintains it.
But if the 'apparent' fault is over pressure (even if there isn't any in reality...) then the pump wont run and well - i *think* you would not be able to complete the bleed test.
Keep us posted.


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--- End quote ---
Forgive my ignorance, and I've looked it up, but how do I perform a bleed test via GS-911? Cant find anything specific on the menus. I am beginning to think its defiantly electronic rather than mechanical. I did suffer a low battery problem last week and I tried to start without success. Hence the new battery. Came to work on the bike tonight and low and behold when I turned on the ignition both motors in the ABS unit ran, you can hear a definite twin motor note when all is fine during its self test. Leaned over and pressed the rear lever, motor ran. Hooray I cried. Plugged in the 911 and readings were nominal. 5 mins later all bad again. Spent all night then re-bleeding testing micro switches wiring and so forth. I'm done in.

Ghiribizzo:
I'll get back to you tomorrow. GS911 is not 'here'...
When you say you were re-bleeding - can I ask how you did it?


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